International problems require international responses. Britain faces the same threats as all other European countries: from terrorism and declining relations with Russia to climate change and the instability caused by global poverty.
Britain will face these challenges more effectively by working with our European allies - something that America and the Commonwealth understand and support.
The EU gives us security and strength in a turbulent world.
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Britain is a powerful and influential country. But our power and influence are hugely increased by our membership of the EU. When Russia invaded Ukraine, Britain was instrumental in drawing up tough EU sanctions that impacted the Russian economy - something Britain could not have achieved on its own.
Terrorism does not recognise borders, which is why working with EU countries in the fight against crime is so important. The European Arrest Warrant makes it easier to deport foreign criminals, and to bring British criminals who have fled abroad to justice.
Within the EU, Britain can also tackle climate change more effectively. On its own, the UK would be too small to successfully lead the global effort to deal with global warming. As an EU member state, however, we can. 20% of the EU’s budget is to be spent on climate change, and the EU has a proven track record of leadership on the issue, including reducing carbon emissions today to 19% below their level in 1990.